On 6/8/2016 03:48AM,  Christophe Leroy <christophe.leroy@c-s.fr> wrote :

> -----Original Message-----
> From: Christophe Leroy [mailto:christophe.leroy@c-s.fr]
> Sent: Saturday, August 06, 2016 12:59 AM
> To: Zhao Qiang <qiang.zhao@freescale.com>; lauraa@codeaurora.org
> Cc: catalin.marinas@arm.com; linux-kernel@vger.kernel.org; Scott Wood
> <oss@buserror.net>; olof@lixom.net; akpm@linux-foundation.org; linuxppc-
> dev@lists.ozlabs.org; X.xie@freescale.com
> Subject: Re: [PATCH v13 3/6] CPM/QE: use genalloc to manage CPM/QE muram
> 
> 
> 
> Le 30/11/2015 à 03:48, Zhao Qiang a écrit :
> > Use genalloc to manage CPM/QE muram instead of rheap.
> >
> > Signed-off-by: Zhao Qiang <qiang.zhao@freescale.com>
> > ---
> > Changes for v9:
> > 	- splitted from patch 3/5, modify cpm muram management functions.
> > Changes for v10:
> > 	- modify cpm muram first, then move to qe_common
> > 	- modify commit.
> > Changes for v11:
> > 	- factor out the common alloc code
> > 	- modify min_alloc_order to zero for cpm_muram_alloc_fixed.
> > Changes for v12:
> > 	- Nil
> > Changes for v13:
> > 	- rebase
> >
> >  arch/powerpc/include/asm/cpm.h   |   3 +
> >  arch/powerpc/platforms/Kconfig   |   4 +-
> >  arch/powerpc/sysdev/cpm_common.c | 126
> +++++++++++++++++++++++++++------------
> >  lib/genalloc.c                   |   2 +-
> >  4 files changed, 94 insertions(+), 41 deletions(-)
> >
> 
> With that patch applied, I get the following Oops on a 8xx (Which has a CPM1).
> 
> cpm_muram_init() is called from setup_arch()
> 
> It seems that gen_pool_add() tries to kmalloc() memory but the SLAB is not
> available yet.
> 

Thank you for your comments, I can't find a 8xx board, would you like to test the patch 
Attached on your board? 

> [    0.000000] Unable to handle kernel paging request for data at
> address 0x00000008
> [    0.000000] Faulting instruction address: 0xc01acce0
> [    0.000000] Oops: Kernel access of bad area, sig: 11 [#1]
> [    0.000000] PREEMPT CMPC885
> [    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted
> 4.4.14-s3k-dev-g0886ed8-svn #5
> [    0.000000] task: c05183e0 ti: c0536000 task.ti: c0536000
> [    0.000000] NIP: c01acce0 LR: c0011068 CTR: 00000000
> [    0.000000] REGS: c0537e50 TRAP: 0300   Not tainted
> (4.4.14-s3k-dev-g0886ed8-svn)
> [    0.000000] MSR: 00001032 <ME,IR,DR,RI>  CR: 28044428  XER: 00000000
> [    0.000000] DAR: 00000008 DSISR: c0000000
> GPR00: c0011068 c0537f00 c05183e0 00000000 00009000 ffffffff 00000bc0 ffffffff
> GPR08: ff003000 ff00b000 ff003bbf 00000000 22044422 100d43a8 00000000
> 07ff94e8
> GPR16: 00000000 07bb5d70 00000000 07ff81f4 07ff81f4 07ff81f4 00000000
> 00000000
> GPR24: 07ffb3a0 07fe7628 c0550000 c7ffa190 c0540000 ff003bbf 00000000
> 00000001
> [    0.000000] NIP [c01acce0] gen_pool_add_virt+0x14/0xdc
> [    0.000000] LR [c0011068] cpm_muram_init+0xd4/0x18c
> [    0.000000] Call Trace:
> [    0.000000] [c0537f00] [00000200] 0x200 (unreliable)
> [    0.000000] [c0537f20] [c0011068] cpm_muram_init+0xd4/0x18c
> [    0.000000] [c0537f70] [c0494684] cpm_reset+0xb4/0xc8
> [    0.000000] [c0537f90] [c0494c64] cmpc885_setup_arch+0x10/0x30
> [    0.000000] [c0537fa0] [c0493cd4] setup_arch+0x130/0x168
> [    0.000000] [c0537fb0] [c04906bc] start_kernel+0x88/0x380
> [    0.000000] [c0537ff0] [c0002224] start_here+0x38/0x98
> [    0.000000] Instruction dump:
> [    0.000000] 91430010 91430014 80010014 83e1000c 7c0803a6 38210010
> 4e800020 7c0802a6
> [    0.000000] 9421ffe0 bf61000c 90010024 7c7e1b78 <80630008> 7c9c2378
> 7cc31c30 3863001f
> [    0.000000] ---[ end trace dc8fa200cb88537f ]---